Partitioning device for mixer

ABSTRACT

A partitioning device is provided on a mixer wherein a bowl is held on the front side of the pillar of the machine body, and a mixing tool is rotated in the bowl by a mixing shaft which extends downward from a head protruding forward from the upper part of the pillar. The partitioning device includes a partitioning member, which has an annular rail and a surface member, a fixed roller(s) and a movable roller(s), which fit with the rail of the partitioning member, a fixed roller supporting means, which supports the fixed roller so that the fixed roller is prevented from shifting in relation to the machine body, and a movable roller supporting means, which supports the movable roller so that the distance between the movable roller and the fixed roller can be varied, and biases the movable roller in a direction to move toward the fixed roller.

TECHNICAL FIELD

The present invention belongs to the field of mixers for mixingmaterials such as food and chemicals, and in particular, relates to apartitioning device which protects hands of operators by preventing suchhands from entering into the bowl in which a material is being mixed andprevents the material from scattering.

BACKGROUND ART

The present inventor proposed a partitioning device for mixer of thiskind, which was disclosed in Japanese patent unexamined publicationgazette 2001-38186. The partitioning device is designed for a mixerwherein a bowl is supported on the front side of a pillar of the machinebody, and a mixing tool is rotated in the bowl by a mixing shaft whichextends downward from a head protruding forward from the upper part ofthe pillar. The partitioning device comprises an annular guide ringwhich is arranged to surround the mixing shaft beneath the head, aprotective fence which is formed into a tube having a local opening andextends from the guide ring toward the circumference of the bowl, and aguide rail which is mounted on the machine body to surround the outercircumference of the guide ring and rotatably support rollers beingfitted with the guide ring. When the protective fence is located tocover the upper part of the front of the bowl, hands of operators willbe prevented from entering into the rotation area of the mixing tool.When the protective fence is moved revolutionarily so that its openingcomes to the upper part of the front of the bowl, the operators will beable to feed materials, visually check the materials in the bowl, andfix or unfix the mixing tool. The guide rail is divided into two parts,a right one and a left one, and they are disconnectably fitted together.With this division, the partitioning device can be put on or taken awayfrom the machine body. With this arrangement, the protective fence canbe washed whole, and the interior of the machine body can be cleanedeasily, and in turn, the sanitary conditions of the mixer can bemaintained satisfactorily.

To disconnectably fit the guide rail, which is divided into two parts,the right portion and the left portion, onto this mixer, the mixer isprovided with fitting means such as buckles. When the protective fenceis to be disconnected from the machine body, if the fitting means areundone, the protective fence will drop off the guide rail. Hence it isnecessary to hold the protective fence by one hand and undo the fittingmeans by the other hand. This will exceedingly reduce the efficiency ofthe operation. To cope with this, one idea may be to provide the machinebody with a leaf spring at a point which comes below the guide ring ofthe protective fence to receive the falling protective fence once bythis leaf spring. Then the operator can pull the protective fencedownwards by exerting a force which exceeds the elastic force of theleaf spring to retract and disconnect the protective fence from themachine body. In this way the operator can disconnect the protectivefence from the machine body by holding the protective fence with bothhands. In this case, however, when the protective fence is to beinstalled on the machine body, the operator will need to flex the leafspring in the reverse direction. This, in turn, will require a knack infitting the protective fence on the machine body and pose a problem ofreduced efficiency of operation.

As mixers are produced according to varied sets of specifications andprotective fences which are applicable to these mixers vary in size,varied guide rails must be provided according to the kinds of theprotective fences. This is a cost-raising factor.

If the guide ring of the protective fence is not formed to be a truecircle due to, for example, dispersion in manufacture, the gap betweenthe guide ring and the roller is not constant along the circumferenceand will pose a problem of irregular revolutionary movement of theprotective fence and, in turn, difficulty in its use.

DISCLOSURE OF INVENTION

The present invention was made in view of these points, and itsobjective is to provide a partitioning device for mixer, wherein apartitioning member such as a protective fence is held by movablerollers, and with this arrangement, the partitioning member can beremoved from or installed on the machine body of the mixer by holdingthe partitioning member by both hands, and a plurality of kinds ofpartitioning members can be used commonly, and dispersions in theconfiguration of individual partitioning members are absorbed to ensuretheir smooth revolutionary movement.

To accomplish the above-mentioned objective, the partitioning device formixer according to the present invention is a partitioning device whichis provided on a mixer wherein a bowl is held on the front side of thepillar of the machine body, and a mixing tool is rotated in the bowl bya mixing shaft which extends downward from a head protruding forwardfrom the upper part of the pillar, the partitioning device ischaracterized in that it comprises a partitioning member, which has anannular rail being arranged beneath the head to surround the mixingshaft and a surface member having a local opening and being formed intoa tube to extend from the rail toward the circumference of the bowl, atotal of at least three rollers being a combination of fixed roller andmovable roller, which fit with the rail of the partitioning member fromthe inside or the outside to support the partitioning member movablyaround the mixing shaft, a fixed roller supporting means, whichrotatably supports the fixed roller in such a way that the fixed rolleris prevented from shifting in relation to the machine body, and amovable roller supporting means, which supports the movable roller insuch a way that the movable roller can rotate and the distance betweenthe movable roller and the fixed roller can be varied, and energizes themovable roller in a direction to close to the fixed roller.

In the case of this partitioning device for mixer, the partitioningmember is made to move by rotating the fixed roller and the movableroller which fit with the rail thereof. When the partitioning member ispositioned to cover the upper part of the front of the bowl, hands ofthe operator will be prevented from entering into the rotation area ofthe mixing tool, and the materials will be prevented from beingscattered. Moreover, when the partitioning member is positioned in sucha way that its opening comes to the upper part of the front of the bowl,the operator will be able to feed a material, visually check thematerial in the bowl and fix or unfix a mixing tool.

When the partitioning member is to be removed from the machine body, theoperator will hold the partitioning member by hands and push thepartitioning member to press the movable roller in a direction againstits energizing force. Then the rail of the partitioning member will comeoff the fixed roller. When the operator lowers the released rail portionto shift the partitioning member downward aslant away from the fixedroller, the partitioning member will be removed from the machine body.When the partitioning member is to be fitted on the machine body, theoperator will hold the partitioning member by hands in such a way thatthe movable roller side of the partitioning member is raised a littlehigher than the other side, and the operator will fit the rail of thepartitioning member with the movable roller and push the movable rollerin a direction against its energizing force, then make the partitioningmember level and allow the partitioning member to move in the directionof the energizing force of the movable roller so that the rail of thepartitioning member fits with the fixed roller. As a result, thepartitioning member will be fitted on the machine. The above-mentionedoperation can be done easily by holding the partitioning member withboth hands. When the partitioning member is removed from the machinebody, the partitioning member can be washed whole, and the interior ofthe machine body can be cleaned with ease, and the sanitary conditionsof the mixer can be maintained satisfactorily.

As the movable roller is held in such a way that the distance betweenthe movable roller and the fixed roller can be varied, and is energizedin a direction to close to the fixed roller, a plurality of partitioningmembers of varied rail diameters can be supported between the fixedroller and the movable roller, and the cost can be reduced through theuse of common parts for various mixers. Moreover, even if the rail of apartitioning member is out of a true circle, the movable roller willshift to vary the distance between the movable roller and the fixedroller. Hence the fixed roller and the movable roller can fit with therail stably and the partitioning member can make smooth revolutionarymovement.

As described above, the partitioning device for mixer according to thepresent invention can ensure the safety of the operators, prevent thematerials from scattering, and provide convenience of feeding materialsor the like, by means of the partitioning member, and can maintain thesanitary conditions of the mixer satisfactorily by allowing thepartitioning member to be fitted on or removed from the machine body.Moreover, as the partitioning member can be removed from or fitted onthe machine body by holding it with both hands, the efficiency offitting or removing the partitioning member can be enhancedsignificantly. Furthermore, as a plurality of different kinds ofpartitioning members can be used in common, the cost can be reduced. Asthe dispersion or tolerance in the configuration of rails ofpartitioning members can be compensated or absorbed, smoothrevolutionary movement of the partitioning members can be assured.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a mixer which is provided with the firstembodiment of the partitioning device. The partitioning member islocated to cover the upper part of the front of the bowl.

FIG. 2 is a perspective view which shows a partitioning member, fixedrollers, movable rollers, a fixed roller supporting means, a movableroller supporting means, etc. of the above-mentioned partitioningdevice. The partitioning member is located to cover the upper part ofthe front of the bowl.

FIG. 3 is a perspective view showing the partitioning member of thepartitioning device.

FIG. 4 is an exploded perspective view showing the fixed rollers, thefixed roller supporting means, a fixed cover, etc. of the partitioningdevice.

FIG. 5 is an exploded perspective view showing the movable rollers, themovable roller supporting means, etc. of the partitioning device.

FIG. 6 is a plan view which partly sections the movable rollersupporting means of the partitioning device to explain advancing andretracting functions of an arm.

FIG. 7 is a plan view which partly sections the movable rollersupporting means of the partitioning device to explain an oscillatingfunction of the arm.

FIG. 8 is a perspective view which shows the partitioning member, thefixed rollers, the movable rollers, the fixed roller supporting means,the movable roller supporting means, etc. of the partitioning device.The partitioning member is located in such a way that its opening comesto the upper part of the front of the bowl.

FIG. 9 is a perspective view of some parts, which shows that the movablerollers are being pressed by the partitioning member in a directionagainst their energizing forces.

FIG. 10 is a perspective view of some parts, which shows that thepartitioning member is being shifted downward aslant away from the fixedrollers.

FIG. 11 is a plan view of some parts of the second embodiment of thepartitioning device.

BEST MODE FOR CARRYING OUT THE INVENTION

In the following, the embodiments of the partitioning device for mixeraccording to the present invention will be described with reference tothe attached drawings. In FIG. 1 showing the first embodiment, 10denotes the machine body of a mixer, and the machine body 10 comprises astand 11, a pillar 12 rising from the rear end of the stand 11, and ahead 13 protruding forward from the upper part of the pillar 12. Themachine body 10 supports, on the front side of the pillar 12, a bowl 20,which opens upward. The mixer is provided with a bowl holder, whichholds the bowl 20, and a lifting mechanism, which lifts and lowers thebowl holder. The lifting mechanism may be, for example, one which isoperated through a panel to lift and lower the bowl holder by hydraulicpower, electric power, etc. Or it may be one which is operated by alever through a linkage to lift and lower the bowl holder. A mixingshaft 14 extends downward from the above-mentioned head 13, and a mixingtool 15 is attached to the bottom end of the mixing shaft 14. When themixing shaft 14 is rotated by a motor which is housed in the machinebody 10, the mixing tool 15 will rotate in the bowl to mix the materialsin the bowl. In the case of this embodiment, the mixing shaft 14 rotateson its own axis while it moves around its revolution axis. However, themixing shaft 14 may make either revolution or rotation.

A partitioning member 30 as shown in FIG. 3 is provided between the head13 and the bowl 20. The partitioning member 30 comprises an annular rail31, which is arranged beneath the head 13 to surround the mixing shaft14, and a surface member 32, which is formed into a tube having localopenings and extends from the rail 31 toward the circumference of thebowl 20. A groove is formed on the inner circumference side or the outercircumference side of the rail 31 over the entire circumference. In thecase of this embodiment, the rail 31 is formed by arranging two firstannular members 31 a with a vertical interval between them. Each firstannular member 31 a is formed by winding a rod material into a ring. Agroove 31 b is formed between these two first annular members 31 a onthe outer circumference side over the entire circumference. These firstannular members 31 a are fixed onto the surface member 32, which isarranged on the inner circumference side of the first annular members 31a, by welding or the like. The surface member 32 may be made of a platepiece or may be formed as a fence or a net. What is needed is that thesurface member 32 can exhibit a function of preventing the hands ofoperators from entering. In the case of this embodiment, the surfacemember 32 comprises a fence 32 a, which is formed by a large number ofrods which are fixed at their top ends to the inner side of the firstannular members 31 a and extend downward aslant, and a second annularmember 32 b, which is formed by winding a rod material into a ring andconnects the lower ends of the fence 32 a. The surface member 32 haslocal openings. To be more precise, a portion is missing over about onehalf circumference of the tubular surface member 32 to form an opening32 c. Moreover, a portion of the surface member 32 is formed into avertical face, and an opening 32 d is formed on the outer circumferenceside of this vertical face. Either one of these openings may beprovided.

As shown in FIG. 2, fixed rollers 41 and movable rollers 42 fit with therail 31 of the partitioning member 30 on the inner side or the outerside thereof, and the partitioning member 30 is supported by these fixedrollers 41 and movable rollers 42. In the case of this embodiment, asthe groove 31 b is formed on the outer circumference side of the rail31, the fixed rollers 41 and the movable rollers 42 fit into the groove31 b from the outer side. The fixed rollers 41 and the movable rollers42 can rotate around axes which are parallel with the mixing shaft 14,and the partitioning member 30 is arranged to be moved around the mixingshaft 14 by the rotation of the fixed rollers 41 and the movable rollers42 around these axes. At least a total of three rollers, in combinationof the fixed roller(s) 41 and the movable roller(s) 42, are provided.

The machine body 10 is provided with a fixed roller supporting means 50,which supports the fixed roller 41 in such a way that the fixed roller41 can rotate but does not make any shift in relation to the body 10. Asshown in FIG. 4, in the case of this embodiment, the fixed rollersupporting means 50 is a plate-shaped bracket. This fixed rollersupporting means 50 is formed into a bow in plan view, and itsintermediate part is fixed to the rear part of the lower face of thehead 13, and its ends protrude forward aslant. A fixed roller 41 isrotatably provided on the lower side of each of these ends. The fixedroller supporting means 50 is provided, as occasion demands, with afixed cover 51, which prevents materials from being scattered rearwardor sideways. The fixed cover 51 is formed to be a tubular plate memberof which front half is cut away, and the remaining portion covers therear half of the space between the head 13 and the bowl 20. In the caseof this embodiment, the partitioning member 30 and the fixed rollers 41are provided on the inner circumference side of the fixed cover 51, butthey may be provided on the outer circumference side of the fixed cover51.

The machine body 10 is provided with a movable roller supporting means60, which supports the movable roller 42 in such a way that the movableroller 42 can be rotated and the distance between the movable roller 42and the fixed roller 41 can be varied and energizes the movable roller42 in a direction to close to the fixed roller 41. As shown in FIG. 5,the movable roller supporting means 60 comprises a body 61, which isprovided on the machine body 10, an arm 62, which is provided on thebody 61 to rotatably support the movable roller 42 and to ensure thatthe distance between the movable roller 42 and the fixed roller 41 canbe varied and the arm 62 can oscillate in plan view, and an elasticmember 63, which is provided between the body 61 and the arm 62 toenergize the arm 62 to close to the fixed roller 41. In the case of thisembodiment, for the convenience in fabrication, assembly, etc., the body61 is divided into three kinds of parts, namely, a first member 61 a,which is fixed on the front side of the lower face of the head 13, asecond member 61 b, which is fixed on the bottom side of the firstmember 61 a, and two third members 61 c, which fit with both ends of thesecond member 61 b. The arm 62 is formed into a bow in plan view, andtwo supporting bars 62 a extend forward from its intermediate part inparallel to each other. In each of both ends of the arm 62, a U-shapedfitting hole 62 b, which is narrowed at the entrance, is provided, and aconstricted part of the intermediate part, in the height direction, ofthe movable roller 42 is rotatably fitted in each of the fitting holes62 b. As an alternative to this, the movable roller may be rotatablysupported by a shaft which penetrates through it. Two through holes 61 dare made in the second member 61 b of the body 61 sidewise to penetratethe second member 61 b in the front-rear direction, and theabove-mentioned supporting bars 62 a fit in the respective through holes61 d. With this arrangement, the distance between the arm 62 and thefixed rollers 41 can be varied (see FIG. 6). The internal dimension inthe right-left direction of the through holes 61 d is made a littlelarger than the right-left width of the supporting bars 62 a, and withthis arrangement, the arm 62 can oscillate in plan view (see FIG. 7).The front end of the through hole 61 d is blocked by a third member 61c, and a coil spring 63 being an elastic member is squeezed and loadedin the space between this blocking face and the supporting bar 62 a toenergize the arm 62 to close to the fixed rollers 41. 64 and 65 denotesleeves which are inserted, as occasion demands, into the through holes61 d. 66 denotes a locking knob. The locking knob 66 rotatably fits,from the front, into a through hole 61 e which is made in the secondmember 61 b. A groove is made, in a radial direction, in the rearportion of the locking knob 66. On the other hand, a locking bar 62 cextends forward from the intermediate part of the arm 62, and acrossbar, which can be loosely inserted into the groove of theabove-mentioned locking knob 66, is formed on the top end of the lockingbar 62 c. When the locking knob 66 is in a release position, thecrossbar of the locking bar 62 c can fit loosely in the groove of thelocking knob 66. Thus the arm 62 can move much in the forward direction.When the locking knob 66 is turned into the lock position, the crossbarof the locking bar 62 c can contact the faces on both sides of thegroove of the locking knob 66. Thus the forward movement of the arm 62is limited to prevent the partitioning member 30 from being droppedinadvertently. 67 denotes magnets which are preferably provided on thelocking knob 66. When the locking knob 66 comes to the above-mentionedrelease position or the lock position, these magnets will exhibit afunction of tacking the knob 66 in the position by attracting acounterpart magnet in the body 61. The second member 61 b is providedwith two rod-shaped stoppers which vertically move in through holes 61e. The above-mentioned crossbar is located on the front side of thesestoppers. Hence the arm 62 does not slip off the body 61 backwardbecause the crossbar will contact the stoppers to halt (see FIG. 5through FIG. 7). It should be noted that when a measure such as properlysetting the elastic force of the elastic member according to applicationis taken, even if a force works on the partitioning member 30 to dropoff, the arm can amply cope with the force and eliminate the possibilityof the drop of the partitioning member 30. In such a case, there is noneed of providing a drop prevention mechanism which uses the lockingknob 66. The present invention includes embodiments wherein no dropprevention mechanism using the locking knob 66 or the like is provided.

Accordingly, in the case of the partitioning device for mixer of thefirst embodiment, the partitioning member 30 is moved when the fixedrollers 41 and the movable rollers 42 fitting with the rail 31 thereofare rotated. And, as shown in FIG. 1 and FIG. 2, when the partitioningmember 30 is located to cover the upper part of the front of the bowl,hands of the operators will be prevented from entering into the rotationarea of the mixing tool 15 and the materials are prevented fromscattering. As shown in FIG. 8, when the partitioning member 30 islocated in such a way that its openings 32 c, 32 d come to the upperpart of the front of the bowl, the operators will be able to feed amaterial, visually check the material in the bowl 20 and fix or unfixthe mixing tool 15.

When the partitioning member 30 is to be removed from the machine body10, as shown in FIG. 9, the partitioning member 30 is held by hands andthe movable rollers 42 are pressed in a direction against theirenergizing forces (forward in this embodiment). Then the rail 31 of thepartitioning member 30 will come off the fixed rollers 41. As shown inFIG. 10, when the released rail portion is lowered and the partitioningmember 30 is shifted downward aslant away from the fixed rollers 41, thepartitioning member 30 will be released from the machine body 10. Whenthe partitioning member 30 is to be fitted on the machine body 10, theabove-mentioned procedure can be reversed. The partitioning member 30 isheld by hands in such a way that the movable roller 42 side of thepartitioning member 30 is raised a little higher than the other side,and the rail 31 of the partitioning member 30 is made to fit with themovable rollers 42 and the movable rollers 42 are pressed in a directionagainst their energizing forces. Then the partitioning member 30 is madelevel and it is allowed to move in the direction of the energizingforces of the movable rollers 42 and the rail 31 of the partitioningmember 30 is made to fit with the fixed rollers 41. As a result, thepartitioning member 30 is fitted on the machine body 10. Theabove-mentioned operation can be done easily by holding the partitioningmember 30 with both hands. When the partitioning member 30 is removedfrom the machine body 10, the partitioning member 30 can be washedwhole, and the interior of the machine body can be cleaned with ease,and the sanitary conditions of the mixer can be maintainedsatisfactorily.

As the movable rollers 42 are supported in such a way that the distancebetween the movable rollers 42 and the fixed rollers 41 can be variedand the movable rollers 42 are spring-biased or energized in a directionto close toward or move toward the fixed rollers 41, a plurality ofdifferent partitioning members 30, of which rails 31 have varieddiameters, can be selectively supported between the fixed rollers 41 andthe movable rollers 42, and in turn, the cost can be reduced through theuse of common parts for various mixers. Moreover, even if the rail 31 ofthe partitioning member 30 is not a true circle, as the movable rollers42 shift in such a way that the distance between the movable rollers 42and the fixed rollers 41 varies, both the fixed rollers 41 and themovable rollers 42 always fit with the rail 31 stably, and thepartitioning member 30 makes a smooth revolutionary movement.

The present invention includes all embodiments of the partitioningdevice wherein at least three rollers in total, in combination of thefixed roller and the movable roller, are provided. Of such embodiments,the partitioning device of the above-mentioned embodiment is providedwith two fixed rollers 41 and two movable rollers 42. With thisarrangement, all the rollers fit with a rail 31 of any curvature, andthe partitioning member 30 is more stably supported than the casewherein a total of three rollers, in combination of the fixed roller 41and the movable roller 42, are provided.

The present invention includes all embodiments of the partitioningdevice which is provided with a movable roller supporting means whereinthe movable roller is supported in such a way that the movable rollercan be rotated and the distance between the movable roller and the fixedroller can be varied, and the movable roller is biased or energized in adirection to close toward or move toward the fixed roller. Suchembodiments include embodiments wherein the movable roller supportingmeans has a simple structure and comprises one supporting bar 62 a, onethrough hole 61 d and one coil spring 63. Among such embodiments, thepartitioning device of the above-mentioned embodiment has a movableroller supporting means 60, which comprises a body 61, which is providedon the machine body 10, an arm 62, which is provided on the body 61 torotatably support the movable rollers 42 and to ensure that the distancebetween the movable roller 42 and the fixed roller 41 can be varied andthe movable roller 42 can oscillate in plan view, and an elastic member63, which is provided between the body 61 and the arm 62 to bias orenergize the arm 62 to close toward or move toward the fixed roller 41.With this arrangement, due to the oscillation of the arm 62, the movableroller 42 shifts to directions which cross the direction in which themovable roller 42 moves toward the fixed roller 41. Accordingly, notonly when the partitioning member 30 rotates around the center of therail 31 but also when the partitioning member 30 rotates while making arevolution little by little, the movable roller 42 satisfactorilyfollows the turning rail 31 to always fit with the rail 31 stably, andin turn, the partitioning member 30 rotates smoothly.

FIG. 11 shows some parts of the second embodiment of the partitioningdevice for mixer. The description of the above-mentioned firstembodiment, including the reference characters, is reiterated in itsentirety as the description of the second embodiment, and onlyconfigurations and effects which differ from those of the firstembodiment will be described in the following. In the case of the firstembodiment, the first annular members 31 a are arranged with a verticalinterval between them to form the rail 31. The groove 31 b is formedbetween these two first annular members 31 a on the outer circumferenceside over the entire circumference, and the fixed rollers 41 and themovable rollers 42 are fitted in this groove 31 b. In the case of thesecond embodiment, the first annular members 31 a are arranged with avertical interval between them to form a rail 31, and a groove 31 b isformed between these two first annular members 31 a on the innercircumference side over the entire circumference. Then fixed rollers 41and movable rollers 42 are fitted in this groove 31 b. As a result, thefixed roller supporting means 50 and the movable roller supporting means60 are located on the inner side of the rail 31 in plan view. Theoperation and the effects of the partitioning device for mixer of thesecond embodiment are the same as those of the first embodiment.

In the respective embodiments mentioned above, the fixed rollersupporting means is provided separately from the machine body, but thefixed roller supporting means may be integrated with the machine body tomake a part of the machine body function as the fixed roller supportingmeans. This also applies to the body of the movable roller supportingmeans. In the above-mentioned embodiments, the body is divided intothree parts, but it may comprise one member, two members, or four ormore members. The present invention is also applicable to mixers whichare not provided with a lifting mechanism for the bowl.

With the description of these embodiments, the first partitioning devicefor mixer of the present invention, which was described in “Disclosureof Invention” above has been fully disclosed. Moreover, with thedescription of these embodiments, the second and third partitioningdevices of mixer, which will be described below, have been fullyexplained.

The second partitioning device for mixer is the first partitioningdevice for mixer wherein two fixed rollers and two movable rollers areprovided. With this arrangement, as all the rollers fit with a rail ofany curvature, the rollers can function effectively. Moreover, thepartitioning member is supported more stably than the case wherein atotal of three rollers, in combination of the fixed roller and themovable roller, are provided.

The third partitioning device for mixer is the first partitioning devicefor mixer or the second partitioning device for mixer, wherein themovable roller supporting means comprises a body, which is provided onthe machine body, an arm, which is provided on the body to rotatablysupport the movable roller and to ensure that the distance between themovable roller and the fixed roller can be varied and the arm canoscillate in plan view, and an elastic member, which is provided betweenthe body and the arm to energize the arm to close to the fixed roller.With this arrangement, due to the oscillation of the arm, the movableroller shifts to directions which cross the direction in which themovable roller closes to the fixed roller. Accordingly, not only whenthe partitioning member rotates around the center of the rail but alsowhen the partitioning member rotates while making a revolution little bylittle, the movable roller satisfactorily follows the turning rail toalways fit with the rail stably, and in turn, the partitioning memberrotates smoothly.

What is claimed is:
 1. A partitioning device for mixer, which isprovided on a mixer wherein a bowl is held on the front side of thepillar of the machine body, and a mixing tool is rotated in the bowl bya mixing shaft which extends downward from a head protruding forwardfrom the upper part of the pillar, the partitioning device beingcharacterized in that it comprises a partitioning member, which has anannular rail being arranged beneath the head to surround the mixingshaft and a surface member having a local opening and being formed intoa tube to extend from the rail toward the circumference of the bowl, atotal of at least three rollers being a combination of fixed roller andmovable roller, which fit with the rail of the partitioning member fromthe inside or the outside to support the partitioning member movablyaround the mixing shaft, a fixed roller supporting means, whichrotatably supports the fixed roller in such a way that the fixed rolleris prevented from shifting in relation to the machine body, and amovable roller supporting means, which supports the movable roller insuch a way that the movable roller can rotate and the distance betweenthe movable roller and the fixed roller can be varied, and energizes themovable roller in a direction to close to the fixed roller.
 2. Apartitioning device for mixer as recited in claim 1, wherein two fixedrollers and two movable rollers are provided.
 3. A partitioning devicefor a mixer as recited in claim 2, wherein the movable roller supportingmeans comprises a body, which is provided on the machine body, an arm,which is provided on the body to rotatably support the movable rollerand to ensure that the distance between the movable roller and the fixedroller can be varied and the arm can oscillate in a plan view, and anelastic member, which is provided between the body and the arm toenergize the arm to close to the fixed roller.
 4. A partitioning devicefor a mixer as recited in claim 1, wherein the movable roller supportingmeans comprises a body, which is provided on the machine body, an arm,which is provided on the body to rotatably support the movable rollerand to ensure that the distance between the movable roller and the fixedroller can be varied and the arm can oscillate in a plan view, and anelastic member, which is provided between the body and the arm toenergize the arm to close to the fixed roller.